CN111900878B - Adaptive hysteresis control converter for enhancing transient characteristics, control method and device - Google Patents
Adaptive hysteresis control converter for enhancing transient characteristics, control method and device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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Abstract
The application provides an adaptive hysteresis control converter for enhancing transient characteristics, a control method and equipment, wherein the converter is used for converting input electric energy into electric energy with controllable voltage or current required by a load and comprises a compensation unit, an input unit, a processing unit and a comparison unit. Compared with the prior technical scheme of slope compensation of inductance current sampling, the application utilizes the characteristic that the MOS tube works in a linear resistance region to replace the traditional RC resistor, so that the MOS tube generates different slope compensation characteristics under steady state and transient state conditions, thereby realizing the stability of the converter under steady state, changing the linear resistance value of the MOS by feedback control in transient state, improving the slope compensation capability and improving the transient state characteristic of the hysteresis control converter.
Description
Technical Field
The present application relates to the field of integrated circuits, and in particular, to an adaptive hysteresis control converter, control method and apparatus for enhancing transient characteristics.
Background
Buck converters (Buck switching converters) are widely used in voltage control modes, peak current control modes, and hysteretic control modes. Compared with a voltage control mode and a peak current control mode, the hysteresis control mode has the advantages that a compensation network and an error amplifier are not needed, the loop is simple in structure and self-oscillating, and meanwhile, the transient response speed is high, the power consumption is low, so that the hysteresis control mode is widely applied.
The converter in the hysteresis control mode needs to sample output ripple waves for feedback control, and under the development trend of ultralow feedback reference voltage, the hysteresis control mode is more and more difficult to realize better transient characteristics, so that a slope compensation circuit is added in the hysteresis control mode to enhance the transient characteristics of the converter, the structure of the existing hysteresis control mode converter with the slope compensation circuit is shown in fig. 1 and 2, the existing slope compensation scheme can ensure the stability of a system, but the compensation adopts static compensation, and the transient response of the system cannot be optimized.
For this reason, in order to further improve the transient characteristics of the converter compared to static ramp compensation, hysteretic control mode converters with adaptive ramp compensation schemes are also widely used. The existing adaptive hysteresis control converters mainly have two types:
The technology needs to ensure the accurate design of the capacitor and an external dynamic bias circuit needed by providing a capacitance multiplication effect, and has higher requirements on technical realization;
The other type mainly adopts a self-adaptive slope generating circuit to generate a slope signal representing the inductive current, adopts a hysteresis mode of upper and lower threshold voltages in a dynamic adjustment mode, so that the converter obtains good transient response characteristics, but the circuit is complex to realize and has higher realization cost.
Disclosure of Invention
In view of the problems, the present application has been made to provide an adaptive hysteresis control converter, control method and apparatus that overcomes the problems or at least partially solves the problems with enhanced transient characteristics, including:
An adaptive hysteresis control converter for enhancing transient characteristics, the converter being used for converting input electric energy into electric energy with controllable voltage or current required by a load, the converter comprising a compensation unit, an input unit, a processing unit and a comparison unit, wherein the compensation unit and the processing unit are respectively connected with the input unit and the comparison unit;
the compensation unit comprises a MOS tube M3, a MOS tube M4, a MOS tube M5, an operational amplifier OP3, a capacitor C2, a capacitor C3, an inductor L and a resistor R1;
the drain end and the gate end of the MOS tube M3 are respectively connected with the input unit,
The gate end of the MOS tube M3 is respectively connected with the gate end of the MOS tube M4, the output end of the operational amplifier OP3 and the positive input end of the operational amplifier OP3,
The source end of the MOS tube M3 is respectively connected with the gate end and the drain end of the MOS tube M5, the drain end of the MOS tube M4, one end of the inductor L and the input unit,
The source end of the MOS tube M4 is respectively connected with one end of the capacitor C2 and one end of the capacitor C3,
The source end of the MOS tube M5 is connected with the other end of the capacitor C2, the other end of the inductor L and one end of the resistor R1,
The inverting input terminal of the operational amplifier OP3 is respectively connected with the other end of the capacitor C3, the other end of the resistor R1 and the comparing unit.
Further, the input unit comprises a diode D1, a MOS tube M2, a capacitor C1 and a Buffer;
The Buffer is respectively connected with the gate end and the drain end of the MOS tube M1, the gate end of the MOS tube M2, the processing unit, the input end of the diode D1 and the positive electrode of an input power supply;
The drain end of the MOS tube M1 is connected with the input end of the diode D1; the source end of the MOS tube M1 is respectively connected with the drain end of the MOS tube M2, the other end of the capacitor C1 and one end of the inductor L;
the output end of the diode D1 is respectively connected with the drain end and the gate end of the MOS tube M3 and one end of the capacitor C1;
and the source end of the MOS tube M2 is grounded.
Further, the comparing unit includes a comparator COMP1 and a comparator COMP2;
The output end of the comparator COMP1 is connected with the processing unit; the positive input end of the comparator COMP1 is connected with the other end of the resistor R1; the reverse input end of the comparator COMP1 is connected with the input end of the comparison voltage VFBH;
The output end of the comparator COMP2 is connected with the processing unit; the reverse input end of the comparator COMP1 is connected with the other end of the resistor R1; the positive input of the comparator COMP2 is connected to the input of the comparison voltage VFBL.
Further, the MOS tube M3, the MOS tube M4, and the MOS tube M5 are connected in a split and serial manner to form two clamp tubes, where the MOS tube M5 is a clamp MOS tube.
Further, the linear resistance of the MOS tube M4 is in a linear resistance region of V DS4＜VGS3-VTH3; v GS3 is the voltage between the grid sources of the MOS tube M3; v DS4 is the voltage between the drain and the source of the MOS tube M4; v TH3 is the threshold voltage of the gate end of the MOS transistor M3.
Further, the source end of the MOS transistor M5 is further grounded through an output capacitor Cout.
Further, the inverting input terminal of the operational amplifier OP3 is grounded through a resistor R2.
A control method of an adaptive hysteresis control converter for enhancing transient characteristics,
When the load is stable, the linear resistance of the MOS tube M4 is kept unchanged.
Further, the method comprises the steps of,
When the load changes from light load to heavy load, the linear resistance of the MOS tube M4 is reduced.
An apparatus comprising an adaptive hysteresis control converter of any of the above embodiments that enhances transient characteristics.
The application has the following advantages:
In an embodiment of the application, the compensation unit and the processing unit are connected with the input unit and the comparison unit, respectively; the compensation unit comprises a MOS tube M3, a MOS tube M4, a MOS tube M5, an operational amplifier OP3, a capacitor C2, a capacitor C3, an inductor L and a resistor R1; the drain end and the gate end of the MOS tube M3 are respectively connected with an input unit, the gate end of the MOS tube M3 is respectively connected with the gate end of the MOS tube M4, the output end of the operational amplifier OP3 and the forward input end of the operational amplifier OP3, the source end of the MOS tube M3 is respectively connected with the gate end and the drain end of the MOS tube M5, the drain end of the MOS tube M4, one end of the inductor L and the input unit, the source end of the MOS tube M4 is respectively connected with one end of the capacitor C2 and one end of the capacitor C3, the source end of the MOS tube M5 is respectively connected with the other end of the capacitor C2, the other end of the inductor L and one end of the resistor R1, and the reverse input end of the operational amplifier OP3 is respectively connected with the other end of the capacitor C3, the other end of the resistor R1 and the comparison unit. Compared with the prior technical scheme of slope compensation of inductance current sampling, the application utilizes the characteristic that the MOS tube works in a linear resistance region to replace the traditional RC resistor, so that the MOS tube generates different slope compensation characteristics under steady state and transient state conditions, thereby realizing the stability of the converter under steady state, changing the linear resistance value of the MOS by feedback control in transient state, improving the slope compensation capability and improving the transient state characteristic of the hysteresis control converter.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art hysteretic control mode converter with a ramp compensation circuit according to one embodiment of the present application;
FIG. 2 is a schematic diagram of a prior art hysteretic control mode converter with a ramp compensation circuit according to another embodiment of the present application;
FIG. 3 is a schematic diagram of an adaptive hysteresis control converter with enhanced transient characteristics according to an embodiment of the present application;
Fig. 4 is a schematic diagram of an output ripple superposition process in a converter according to an embodiment of the present application.
Detailed Description
In order that the manner in which the above recited objects, features and advantages of the present application are obtained will become more readily apparent, a more particular description of the application briefly described above will be rendered by reference to the appended drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that, in any embodiment of the present invention, the Buck converter is a Buck switching converter; MOS is a metal oxide semiconductor field effect transistor; v FB is the feedback voltage; FB is the feedback node of the converter; fs is the switching frequency of the converter; c out is an output capacitor; resr is the equivalent internal impedance of the output capacitance; scomp is the compensation intensity; SW is a switching node of the converter; v GS is the voltage between the grid sources of the MOS tube; v DS is the voltage between the drain and the source of the MOS tube; v TH is the threshold voltage of the gate end of the MOS tube; OP is an operational amplifier; COMP is a comparator; BST is a bootstrap boost node and provides power supply voltage for the MOS transistor M1, the MOS transistor M3, the MOS transistor M4 and the MOS transistor M5 respectively.
Referring to fig. 3, there is shown an adaptive hysteresis control converter for enhancing transient characteristics according to an embodiment of the present application, the converter being configured to convert input electric energy into electric energy with controllable voltage or current required by a load, and including a compensation unit, an input unit, a processing unit, and a comparison unit, the compensation unit and the processing unit being connected to the input unit and the comparison unit, respectively;
the compensation unit comprises a MOS tube M3, a MOS tube M4, a MOS tube M5, an operational amplifier OP3, a capacitor C2, a capacitor C3, an inductor L and a resistor R1;
the drain end and the gate end of the MOS tube M3 are respectively connected with the input unit,
The gate end of the MOS tube M3 is respectively connected with the gate end of the MOS tube M4, the output end of the operational amplifier OP3 and the positive input end of the operational amplifier OP3,
The source end of the MOS tube M3 is respectively connected with the gate end and the drain end of the MOS tube M5, the drain end of the MOS tube M4, one end of the inductor L and the input unit,
The source end of the MOS tube M4 is respectively connected with one end of the capacitor C2 and one end of the capacitor C3,
The source end of the MOS tube M5 is connected with the other end of the capacitor C2, the other end of the inductor L and one end of the resistor R1,
The inverting input terminal of the operational amplifier OP3 is respectively connected with the other end of the capacitor C3, the other end of the resistor R1 and the comparing unit.
The application has the following advantages:
In an embodiment of the application, the compensation unit and the processing unit are connected with the input unit and the comparison unit, respectively; the compensation unit comprises a MOS tube M3, a MOS tube M4, a MOS tube M5, an operational amplifier OP3, a capacitor C2, a capacitor C3, an inductor L and a resistor R1; the drain end and the gate end of the MOS tube M3 are respectively connected with an input unit, the gate end of the MOS tube M3 is respectively connected with the gate end of the MOS tube M4, the output end of the operational amplifier OP3 and the forward input end of the operational amplifier OP3, the source end of the MOS tube M3 is respectively connected with the gate end and the drain end of the MOS tube M5, the drain end of the MOS tube M4, one end of the inductor L and the input unit, the source end of the MOS tube M4 is respectively connected with one end of the capacitor C2 and one end of the capacitor C3, the source end of the MOS tube M5 is respectively connected with the other end of the capacitor C2, the other end of the inductor L and one end of the resistor R1, and the reverse input end of the operational amplifier OP3 is respectively connected with the other end of the capacitor C3, the other end of the resistor R1 and the comparison unit. Compared with the prior technical scheme of slope compensation of inductance current sampling, the application utilizes the characteristic that the MOS tube works in a linear resistance region to replace the traditional RC resistor, so that the MOS tube generates different slope compensation characteristics under steady state and transient state conditions, thereby realizing the stability of the converter under steady state, changing the linear resistance value of the MOS by feedback control in transient state, improving the slope compensation capability and improving the transient state characteristic of the hysteresis control converter.
Next, the estimation method of the flow path in the present exemplary embodiment will be further described
Specifically, the adaptive hysteresis control converter is essentially a topology of ripple feedback control, as shown with particular reference to fig. 3.
From an electrical characteristic point of view, the feedback ripple can be expressed as:
Since VFBH-VFBL are approximately constant, the peak-to-peak value of ΔVFB is approximately constant. Therefore, when the output capacitance is only a ceramic capacitance, rser is small, resulting in a small switching frequency Fs, and thus a poor transient response at lower frequencies. In order to improve the problem, the conventional hysteresis control converter introduces a slope compensation circuit for sampling an inductor current to increase the voltage ripple slope of FB, and further increase the switching frequency to achieve better transient response, which is shown in fig. 1 and 2, by sampling the voltage difference between two ends of the inductor L or SW and FB, essentially by a pseudo-current detection mode in which the voltage represents a current, and connecting R3 and C2 in series to achieve constant current charging and discharging of the capacitor, thereby generating a ramp voltage signal Δvripple, and superposing the signal with an output ripple Δvout [ R2/(r1+r2) ] obtained by dividing R1 and R2 to increase the ripple slope of Δvfb, thereby increasing Fs, and achieving better transient response, and the superposition process is shown in fig. 4.
According to the charge-discharge characteristics of the capacitor, the slope compensation strength Scomp oc 1/RC, but the increase of the compensation strength directly affects the loop stability, i.e., it is difficult to ensure the operation stability of the converter in the case of overcompensation, so that the conventional RC slope compensation has a great limit for improving the transient response. Compared with the traditional slope compensation mode adopted by the inductive current, the invention furthest enhances the transient characteristic under the condition of ensuring the stable operation of the circuit.
Further, the input unit comprises a diode D1, a MOS tube M2, a capacitor C1 and a Buffer;
The Buffer is respectively connected with the gate end and the drain end of the MOS tube M1, the gate end of the MOS tube M2, the processing unit, the input end of the diode D1 and the positive electrode of an input power supply;
The drain end of the MOS tube M1 is connected with the input end of the diode D1; the source end of the MOS tube M1 is respectively connected with the drain end of the MOS tube M2, the other end of the capacitor C1 and one end of the inductor L;
the output end of the diode D1 is respectively connected with the drain end and the gate end of the MOS tube M3 and one end of the capacitor C1;
and the source end of the MOS tube M2 is grounded.
Further, the comparing unit includes a comparator COMP1 and a comparator COMP2;
The output end of the comparator COMP1 is connected with the processing unit; the positive input end of the comparator COMP1 is connected with the other end of the resistor R1; the reverse input end of the comparator COMP1 is connected with the input end of the comparison voltage VFBH;
The output end of the comparator COMP2 is connected with the processing unit; the reverse input end of the comparator COMP1 is connected with the other end of the resistor R1; the positive input of the comparator COMP2 is connected to the input of the comparison voltage VFBL.
Further, the MOS tube M3, the MOS tube M4, and the MOS tube M5 are connected in a split and serial manner to form two clamp tubes, where the MOS tube M5 is a clamp MOS tube.
Further, the linear resistance of the MOS tube M4 is in a linear resistance region of V DS4＜VGS3-VTH3; v GS3 is the voltage between the grid sources of the MOS tube M3; v DS4 is the voltage between the drain and the source of the MOS tube M4; v TH3 is the threshold voltage of the gate end of the MOS transistor M3.
Referring to fig. 3, the resistor R3 in the conventional RC compensation is replaced by the MOS transistor M4, so that the M4 and the C2 form a novel RC compensation circuit. M3, M4, M5 constitute clamp split series structure, and the structural principle is as follows:
Under the condition of ensuring that the working voltage of the structure is normal, the connection mode of M3 determines that the unconditional saturation condition is met, and according to the MOS tube mathematical model, M3 and M4 must meet the following relation:
(VGS4-VTH4)-VDS4＝(VGS3+VDS4-VTH4)-VDS4＝VDS3-VTH4
Because of the lining bias effect of M3, VTH3 is more than or equal to VTH4, and because M3 is saturated and conducted with VGS3-VTH3 > 0, the method for manufacturing the same
VTH3+VGS3-VTH3-VTH4≥VGS3-VTH3＞0
Obviously, it is necessary to meet the condition that M4 enters the linear resistive region to reduce the current to meet the current continuity, so M4 must be in the linear resistive region of VDS4 < VGS3-VTH 3.
M5 is a clamping MOS tube and is connected in parallel with the M4 position, and the M5 adopts a diode connection mode, so that under the condition of ensuring enough working voltage, the M5 cannot enter a cut-off state and is in a saturated state, compared with M4 and I5> > I4 working in a linear region, the current-dividing effect is realized, namely the M4 tube is ensured to be always in a linear resistance region, and the current flowing through the M4 is ensured not to be too large, so that the situation of overcompensation or excessive C2 capacitance value is caused.
The BST is used as a high level by the structure, and the high enough voltage is ensured to ensure that M3 and M5 always work in a saturation region, so that M4 always works in a linear resistance region. The voltage at two ends of the inductor L is only related to frequency under the condition of small signals, the transient change instantaneous frequency is approximately constant, and therefore the voltage at two ends of the inductor L is approximately constant, the small signal impedance of the M4 is only controlled by the signal at the gate end of the inductor L, the gate end of the M4 is connected with the output end of the operational amplifier OP3, and the voltage is sampled from the FB through the OP3 to be converted and fed back to the gate end of the M4 rapidly, so that the linear resistance of the inductor is controlled.
Further, the source end of the MOS transistor M5 is further grounded through an output capacitor Cout.
Further, the inverting input terminal of the operational amplifier OP3 is grounded through a resistor R2.
A control method of an adaptive hysteresis control converter for enhancing transient characteristics,
When the load is stable, the linear resistance of the MOS tube M4 is kept unchanged.
Specifically, when the load is stable, the feedback voltage at FB is approximately stable between VFBL and VBFH, and at this time, the linear resistance of M4 is approximately unchanged, and the compensation circuit formed by M4 and C2 can meet the circuit stability requirement in a steady state.
In an embodiment of the present invention, when the load changes from light load to heavy load, the linear resistance of the MOS transistor M4 is reduced.
Specifically, when the load is changed from light load to heavy load, V out forms an undershoot voltage, and the feedback voltage at FB is instantaneously pulled down by dividing the voltage by the resistor R1 and the resistor R2, and at this time, the operational amplifier OP3 rapidly samples and rapidly pulls up the output of the operational amplifier. As can be seen from the operation model in which the MOS operates in the linear region,
When the output of the operational amplifier OP3 increases, the V GS4 of the MOS transistor M4 increases, so that the linear resistance R ds4 decreases, and the transient slope compensation strength is greatly increased and the transient characteristic is further improved compared with the steady state according to the relationship between the slope compensation strength and RC.
From the above, it can be seen that: the self-adaptive hysteresis control converter for enhancing transient characteristics has the technical advantages that: the MOS tube is used for replacing the traditional RC resistor by utilizing the characteristic of working in a linear resistor area, so that different slope compensation characteristics are generated under steady-state and transient conditions, the stability of the converter under steady-state is met, the linear resistance value of the MOS is changed by utilizing feedback control in transient state, the slope compensation capability is improved, and the transient characteristic of the hysteresis control converter is greatly improved.
An apparatus comprising an adaptive hysteresis control converter of any of the above embodiments that enhances transient characteristics.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the application.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
The adaptive hysteresis control converter, the control method and the device for enhancing transient characteristics provided by the application are described in detail, and specific examples are applied to illustrate the principles and the implementation modes of the application, and the description of the above examples is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. An adaptive hysteresis control converter for enhancing transient characteristics, the converter being used for converting input electric energy into electric energy with controllable voltage or current required by a load, comprising a compensation unit, an input unit, a processing unit and a comparison unit, characterized in that the compensation unit and the processing unit are respectively connected with the input unit and the comparison unit;
the compensation unit comprises a MOS tube M3, a MOS tube M4, a MOS tube M5, an operational amplifier OP3, a capacitor C2, a capacitor C3, an inductor L and a resistor R1;
the drain end and the gate end of the MOS tube M3 are respectively connected with the input unit,
The gate end of the MOS tube M3 is respectively connected with the gate end of the MOS tube M4, the output end of the operational amplifier OP3 and the positive input end of the operational amplifier OP3,
The source end of the MOS tube M3 is respectively connected with the gate end and the drain end of the MOS tube M5, the drain end of the MOS tube M4, one end of the inductor L and the input unit,
The source end of the MOS tube M4 is respectively connected with one end of the capacitor C2 and one end of the capacitor C3,
The source end of the MOS tube M5 is connected with the other end of the capacitor C2, the other end of the inductor L and one end of the resistor R1,
The inverting input terminal of the operational amplifier OP3 is respectively connected with the other end of the capacitor C3, the other end of the resistor R1 and the comparing unit.
2. The converter according to claim 1, wherein the input unit comprises a diode D1, a MOS transistor M2, a capacitor C1, and a Buffer;
The Buffer is respectively connected with the gate end and the drain end of the MOS tube M1, the gate end of the MOS tube M2, the processing unit, the input end of the diode D1 and the positive electrode of an input power supply;
The drain end of the MOS tube M1 is connected with the input end of the diode D1; the source end of the MOS tube M1 is respectively connected with the drain end of the MOS tube M2, the other end of the capacitor C1 and one end of the inductor L;
the output end of the diode D1 is respectively connected with the drain end and the gate end of the MOS tube M3 and one end of the capacitor C1;
and the source end of the MOS tube M2 is grounded.
3. The converter according to claim 1, characterized in that said comparing unit comprises a comparator COMP1 and a comparator COMP2;
The output end of the comparator COMP1 is connected with the processing unit; the positive input end of the comparator COMP1 is connected with the other end of the resistor R1; the reverse input end of the comparator COMP1 is connected with the input end of the comparison voltage VFBH;
The output end of the comparator COMP2 is connected with the processing unit; the reverse input end of the comparator COMP1 is connected with the other end of the resistor R1; the positive input of the comparator COMP2 is connected to the input of the comparison voltage VFBL.
4. The converter according to claim 1, wherein the MOS transistor M3, the MOS transistor M4, and the MOS transistor M5 are connected in a split-series manner to form a clamp two-transistor, wherein the MOS transistor M5 is a clamp MOS transistor.
5. The converter according to claim 1, wherein the linear resistance of the MOS transistor M4 is in the linear resistance region of V DS4＜VGS3-VTH3; v GS3 is the voltage between the grid sources of the MOS tube M3; v DS4 is the voltage between the drain and the source of the MOS tube M4; v TH3 is the threshold voltage of the gate end of the MOS transistor M3.
6. The converter according to claim 1, wherein the source of the MOS transistor M5 is further grounded through an output capacitor Cout.
7. The converter according to claim 1, characterized in that the inverting input of the operational amplifier OP3 is grounded via a resistor R2.
8. A control method of an adaptive hysteresis control converter for enhancing transient characteristics according to any one of claims 1-7,
When the load is stable, the linear resistance of the MOS tube M4 is kept unchanged.
9. The method of claim 8, wherein the step of determining the position of the first electrode is performed,
When the load changes from light load to heavy load, the linear resistance of the MOS tube M4 is reduced.
10. An apparatus comprising an adaptive hysteresis control converter of any one of claims 1-7 that enhances transient characteristics.
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| CN114441842B (en) * | 2022-01-17 | 2023-05-02 | 电子科技大学 | Zero-crossing detection circuit for peak current mode control Buck converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103095101A (en) * | 2013-01-11 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Slope compensation circuit |
| CN104158392A (en) * | 2014-09-05 | 2014-11-19 | 电子科技大学 | Ripple compensation control circuit for DC-DC converter |
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| TWI360940B (en) * | 2008-09-12 | 2012-03-21 | Realtek Semiconductor Corp | Voltage converting apparatus |
| CN103023324B (en) * | 2012-11-21 | 2015-04-08 | 东南大学 | Fast transient response DC-DC (direct-current to direct-current) switching converter with high load regulation rate |
| CN104901534B (en) * | 2015-05-19 | 2017-12-19 | 深圳创维－Rgb电子有限公司 | A kind of slope compensation circuit and DC DC conversion equipments |
| CN110277915B (en) * | 2019-07-29 | 2020-11-13 | 电子科技大学 | Adaptive transient response optimization circuit suitable for peak current mode DC-DC converter |
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| CN103095101A (en) * | 2013-01-11 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Slope compensation circuit |
| CN104158392A (en) * | 2014-09-05 | 2014-11-19 | 电子科技大学 | Ripple compensation control circuit for DC-DC converter |
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